08 2012 档案

Calculate texture LOD (level of detail)
摘要：Cg code for texture LOD calculation (copied from http://linedef.com/personal/demos/?p=virtual-texturing): 1 #define TEXTURE_SIZE 512 2 #define TEXTURE_MIPCOUNT 10 3 4 float MipLevel( float2 uv ) 5 { 6 float2 dx = ddx( uv * TEXTURE_SIZE ); 7 float2 dy = ddy( uv * TEXTURE_SIZE ); 8 fl... 阅读全文
posted @ 2012-08-16 09:47 Huidong Chen 阅读(633) 评论(0) 推荐(0)
Calculate the distance between two lines in 3D space
摘要：I just did some math work on the distance between two lines in 3D space. After some boring calculation, I found the result itself is much more decent and help us to revisit the issue in an elegant way.Line 1: p = p1 + t * v1Line 2: p = p2 + t * v2(t is a scalar argument, while v1 and v2 are normaliz 阅读全文
posted @ 2012-08-16 09:17 Huidong Chen 阅读(278) 评论(0) 推荐(0)